package cn.seapon.talkerserver.utils;


import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;
import java.util.Scanner;

public class HttpRequest {
	
	public static String doGetRequest(String urlString) {
		OutputStream out = null;
		InputStream in = null;
		try {
			URL url = new URL(urlString);
			HttpURLConnection con = (HttpURLConnection) url.openConnection();
			con.setRequestMethod("GET");    
			//设置输入输出权限
			con.setDoInput(true);
			con.setDoOutput(true);
			//禁用缓存
			con.setUseCaches(false);
			//设置请求头
			con.setRequestProperty("Charset", "UTF-8");
			
			in = con.getInputStream();
			BufferedReader bfr = new BufferedReader(new InputStreamReader(in));
			String line = bfr.readLine();

//			System.out.println("输入的URL地址是："+urlString+"\n\tSAE返回的json字符串是："+line);
			return line;
		} catch (MalformedURLException e) {
			e.printStackTrace();
			return null;
		} catch (IOException e) {
			e.printStackTrace();
			return null;
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}finally{
			try {
				if (out != null) {
					out.close();
				}
				if (in != null) {
					in.close();
				}
			} catch (Exception e2) {
				e2.printStackTrace();
			}
		}
	}
	
	public static String doPostRequest(String urlString,Map<String, String> nameValuePair) throws IOException{
		URL url = new URL(urlString);
		URLConnection connection = url.openConnection();
		connection.setDoInput(true);
		connection.setDoOutput(true);
		PrintWriter pw = new PrintWriter(connection.getOutputStream());
		boolean isFirst = true;
		for (Map.Entry<String, String> pair : nameValuePair.entrySet() ) {
			if (isFirst) {
				isFirst = false;
			}else {
				pw.print("&");
			}
			pw.print(pair.getKey());
			pw.print("=");
			pw.print( URLEncoder.encode(pair.getValue(), "UTF-8") );
//			System.out.println(pair.getKey()+"   "+URLEncoder.encode(pair.getValue(), "UTF-8"));
		}
//		pw.flush();
		pw.close();
			
		StringBuilder response = new StringBuilder();
		try {
			Scanner scanner = new Scanner(connection.getInputStream());
			while (scanner.hasNextLine()) {
				response.append(scanner.nextLine());
			}
		} catch (IOException e) {
			InputStream errStream = ((HttpURLConnection) connection).getErrorStream();
			if (errStream == null) {
				throw e;
			}
			Scanner scanner = new Scanner(errStream);
			while (scanner.hasNextLine()) {
				response.append(scanner.nextLine()+"\n");
			}
		}
		System.out.println(response.toString());
		return response.toString();
	}

	
    /**
     * 向指定URL发送GET方法的请求
     * 
     * @param url
     *            发送请求的URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return URL 所代表远程资源的响应结果
     */
    public static String sendGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常！" + e);
            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }

    /**
     * 向指定 URL 发送POST方法的请求
     * 
     * @param url
     *            发送请求的 URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection conn = realUrl.openConnection();
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(conn.getOutputStream());
            // 发送请求参数
            out.print(param);
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        //使用finally块来关闭输出流、输入流
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result;
    }    
}